1 files changed, 50 insertions, 0 deletions
diff --git a/protocols/bundles/org.jivesoftware.smack/src/org/jivesoftware/smack/filter/NotFilter.java b/protocols/bundles/org.jivesoftware.smack/src/org/jivesoftware/smack/filter/NotFilter.java
new file mode 100644
index 000000000..4e6e5494c
--- /dev/null
+++ b/protocols/bundles/org.jivesoftware.smack/src/org/jivesoftware/smack/filter/NotFilter.java
@@ -0,0 +1,50 @@
+/**
+ * $RCSfile$
+ * $Revision$
+ * $Date$
+ *
+ * Copyright 2003-2004 Jive Software.
+ *
+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jivesoftware.smack.filter;
+
+import org.jivesoftware.smack.packet.Packet;
+
+/**
+ * Implements the logical NOT operation on a packet filter. In other words, packets
+ * pass this filter if they do not pass the supplied filter.
+ *
+ * @author Matt Tucker
+ */
+public class NotFilter implements PacketFilter {
+
+    private PacketFilter filter;
+
+    /**
+     * Creates a NOT filter using the specified filter.
+     *
+     * @param filter the filter.
+     */
+    public NotFilter(PacketFilter filter) {
+        if (filter == null) {
+            throw new IllegalArgumentException("Parameter cannot be null.");
+        }
+        this.filter = filter;
+    }
+
+    public boolean accept(Packet packet) {
+        return !filter.accept(packet);
+    }
+}